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exis [7]
3 years ago
15

A 7.5 cm object is 14 cm from a concave lens, which has a focal length of –7 cm. Its image is 5 cm in front of the lens. What is

the height of the image?
Round your answer to the nearest whole number.

A. –3 cm

B. 3 cm

C. 21 cm
Physics
2 answers:
Tomtit [17]3 years ago
6 0

Answer:

The answer is 3 cm

Explanation:

Rama09 [41]3 years ago
3 0
Given conditions:
height of object = 7.5cmdistance of object from mirror  = 14 cmfocus length = -7 cmimage distance =  ?
Using mirror formula: 
1/(focus length) = 1/(object distance) + 1/(image distance)
or, -1/7 = 1/14 + 1/(image distance)
or, image distance = -4.66cm (the image formed is a virtual image)


Also, magnification of image is:
image height /height of object = - image distance /object distance
or, image height = - image distance / object distance * height of object
or, image height = -(-4.66) / 14 * 7.5 = 2.49 = 3(nearest whole number)
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The moon Ariel orbits Uranus at a distance of 1.91 x 108 m once every 2.52 days. Use that data to calculate the mass of Uranus.
PIT_PIT [208]

Mu = 8.66 × 10^25 kg

Explanation:

centripetal force = gravitational force

m \frac{ {v}^{2} }{r}  = (grav.const) \frac{m \times mu}{ {r}^{2} }

where

m = mass of moon Ariel

mu = mass of Uranus

r = radius of Ariel's orbit

v = Ariel's velocity around Uranus

To find the velocity, we need to find the circumference of the no orbit and then divide it by the period (2.52 days):

circumference = 2πr = 2π×(1.91 × 10^8 m)

= 1.2 × 10^9 m

period = 2.52 days × (24 h/1 day)×(3600 s/1 hr)

= 2.18 × 10^5 s

v = (1.2 × 10^9 m)/(2.18 × 10^5 s)

= 5.5 × 10^3 m/s

(5.5 × 10^3 m/s)^2/(1.91 × 10^8 m) = (6.67 × 10^-11 m^3/kg-s^2)Mu/(1.91 × 10^8 m)^2

Solving Mu,

Mu = 8.66 × 10^25 kg

4 0
3 years ago
Describe an example of newton’s 3rd law of motion
professor190 [17]

Answer:

For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.

Explanation:

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3 years ago
What contributes the most to food waste in America
Kay [80]

According to the USDA, 40% of our food worth $161 billion is not even harvested, lost in processing, thrown away in restaurants and homes or ended up rotting in America’s landfills. It is also reported that 50% of the produce is never consumed.

Disparities in food distribution and availability imply that numerous communities and neighborhoods have very constrained access to fresh affordable food. Also, a significant number of those with a bounty of food choose to toss it rather than donate it.  

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4 years ago
The following diagrams show five pairs of asteroids, labeled with their relative masses (M) and distances (d) between them. For
serg [7]

Answer:

- d = 2; m = 2; m = 2

- d= 1; m = 1; m = 2

- d = 1; m = 1; m = 1

- d = 2; m = 1; m = 2

- d = 2; m = 1; m = 1

Explanation:

The following diagrams show five pairs of asteroids, labeled with their relative masses (M) and distances (d) between them. For example, an asteroid with M=2 has twice the mass of one with M=1 and a distance of d=2 is twice as large as a distance of d=1. Rank each pair from left to right based on the strength of the gravitational force attracting the asteroids to each other, from strongest to weakest.

- d = 2; m = 2; m = 2

- d= 1; m = 1; m = 2

- d = 1; m = 1; m = 1

- d = 2; m = 1; m = 2

- d = 2; m = 1; m = 1

7 0
3 years ago
A revolutionary war cannon, with a mass of 2260 kg, fires a 21 kg ball horizontally. The cannonball has a speed of 105 m/s after
Marrrta [24]

Answer:

0.97566 m/s

Explanation:

m_1 = Mass of cannon = 2260 kg

v_1 = Velocity of cannon

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As the momentum of the system is conserved we have

m_1v_1=m_2v_2\\\Rightarrow v_1=\dfrac{21\times 105}{2260}\\\Rightarrow v_1=0.97566\ m/s

The velocity of the cannon is 0.97566 m/s

7 0
4 years ago
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